Phy 121
Your 'cq_1_08.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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A ball is tossed upward with an initial velocity of 25 meters /
second. Assume that the acceleration of gravity is 10 m/s^2 downward.
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What will be the velocity of the ball after one second?
answer/question/discussion: ->->->->->->->->->->->-> scussion:
15 m/s due to the force of gravity slowing down the speed of the ball.
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What will be its velocity at the end of two seconds?
answer/question/discussion: ->->->->->->->->->->->-> scussion:
5 m/s
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During the first two seconds, what therefore is its average
velocity?
answer/question/discussion: ->->->->->->->->->->->-> scussion:
15 m/s
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How far does it therefore rise in the first two seconds?
answer/question/discussion: ->->->->->->->->->->->-> scussion:
30 m/s
Careful. It's 30 m, not 30 m/s.
`ds = vAve `dt = 15 m/s * 2 s = 30 (m/s) * s = 30 m.
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What will be its velocity at the end of a additional second,
and at the end of one more additional second?
answer/question/discussion: ->->->->->->->->->->->-> scussion:
-5 m/s
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At what instant does the ball reach its maximum height, and
how high has it risen by that instant?
answer/question/discussion: ->->->->->->->->->->->-> scussion:
At the 2.5 second mark it has reached its maximum height of 31.25 m
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What is its average velocity for the first four seconds, and
how high is it at the end of the fourth second?
answer/question/discussion: ->->->->->->->->->->->-> scussion:
The ball average velocity in the first four seconds is 5 m/s and is 20 m
high.
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How high will it be at the end of the sixth second?
answer/question/discussion: ->->->->->->->->->->->-> scussion:
The ball will be 30 m below the starting point.
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15 min
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&#Good responses. See my notes and let me know if you have questions. &#